They sell fishnet shirts at Hot Topic, but the weave is the wrong size for Chipp. The mesh is really close together and small, like traditional fishnet stockings. What I did when I made a Chipp costume for my boyfriend was buy a pair of fishnet stockings that had the right pattern, (big holes, more of a fence-type weave) and then went old-school goth on them and cut them up to turn them into a fishnet shirt.
You cut a small hole in the 'crotch' of the tights for your head to go through, (Start small, and you can always cut it bigger if you have to, but remember how MUCH fishnets stretch) and put your arms into the legs of the stockings, so that now it's like a shirt. Then it's easiest to have a friend cut the legs off to the length that you want them. And, because fishnet is so stretchy, the rest of the fishnet tights will probably go down to close to your bellybutton. If you do it right, it looks spiffy, and is much easier than trying to make or sew them yourself. You don't have to worry about them running or coming apart or anything either, because it's fishnet. Just make the cuts, and you're done.
The hard part will be finding tights with the right pattern ^-~ But yes, I got mine at Hot Topic. If they're out of stock, or yours dosn't carry them, maybe try some other alternative shop.
If you find yourself struggling with loneliness, you're not alone. And yet you ARE alone. So very alone.